diff --git a/scripts/build b/scripts/build
index 074cd8544c..c6c231d6f7 100755
--- a/scripts/build
+++ b/scripts/build
@@ -384,7 +384,7 @@ pkg_call_exists_opt post_make_${TARGET} && pkg_call
 
 # Hack around directly writing/modifying the content of a shared sysroot
 # by temporarily installing new files to a package specific sysroot
-PKG_ORIG_SYSROOT_PREFIX="${SYSROOT_PREFIX}"
+export PKG_ORIG_SYSROOT_PREFIX="${SYSROOT_PREFIX}"
 export SYSROOT_PREFIX="${BUILD}/.sysroot/${PKG_NAME}.${TARGET}"
 rm -rf "${SYSROOT_PREFIX}"